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116 lines
2.4 KiB
116 lines
2.4 KiB
// Boost.Geometry (aka GGL, Generic Geometry Library) |
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// Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands. |
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// Copyright (c) 2008-2011 Bruno Lalande, Paris, France. |
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// Copyright (c) 2009-2011 Mateusz Loskot, London, UK. |
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library |
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands. |
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// Use, modification and distribution is subject to the Boost Software License, |
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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#ifndef BOOST_GEOMETRY_MULTI_STRATEGIES_CARTESIAN_CENTROID_AVERAGE_HPP |
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#define BOOST_GEOMETRY_MULTI_STRATEGIES_CARTESIAN_CENTROID_AVERAGE_HPP |
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#include <boost/numeric/conversion/cast.hpp> |
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#include <boost/type_traits.hpp> |
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#include <boost/geometry/core/coordinate_type.hpp> |
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#include <boost/geometry/core/point_type.hpp> |
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#include <boost/geometry/arithmetic/arithmetic.hpp> |
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#include <boost/geometry/strategies/centroid.hpp> |
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namespace boost { namespace geometry |
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{ |
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namespace strategy { namespace centroid |
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{ |
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/*! |
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\brief Centroid calculation taking average of points |
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\ingroup strategies |
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*/ |
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template |
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< |
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typename PointCentroid, |
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typename Point = PointCentroid |
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> |
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class average |
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{ |
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private : |
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/*! subclass to keep state */ |
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class sum |
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{ |
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friend class average; |
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int count; |
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PointCentroid centroid; |
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public : |
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inline sum() |
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: count(0) |
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{ |
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assign_zero(centroid); |
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} |
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}; |
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public : |
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typedef sum state_type; |
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typedef PointCentroid centroid_point_type; |
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typedef Point point_type; |
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static inline void apply(Point const& p, sum& state) |
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{ |
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add_point(state.centroid, p); |
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state.count++; |
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} |
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static inline void result(sum const& state, PointCentroid& centroid) |
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{ |
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centroid = state.centroid; |
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divide_value(centroid, state.count); |
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} |
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}; |
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#ifndef DOXYGEN_NO_STRATEGY_SPECIALIZATIONS |
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namespace services |
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{ |
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template <typename Point, std::size_t DimensionCount, typename Geometry> |
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struct default_strategy |
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< |
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cartesian_tag, |
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pointlike_tag, |
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DimensionCount, |
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Point, |
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Geometry |
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> |
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{ |
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typedef average |
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< |
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Point, |
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typename point_type<Geometry>::type |
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> type; |
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}; |
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} // namespace services |
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#endif |
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}} // namespace strategy::centroid |
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}} // namespace boost::geometry |
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#endif // BOOST_GEOMETRY_MULTI_STRATEGIES_CARTESIAN_CENTROID_AVERAGE_HPP
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